#region MigraDoc - Creating Documents on the Fly
//
// Authors:
//   Klaus Potzesny (mailto:Klaus.Potzesny@pdfsharp.com)
//
// Copyright (c) 2001-2009 empira Software GmbH, Cologne (Germany)
//
// http://www.pdfsharp.com
// http://www.migradoc.com
// http://sourceforge.net/projects/pdfsharp
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
// DEALINGS IN THE SOFTWARE.
#endregion

using System;
using System.Reflection;
using System.IO;
using MigraDoc.DocumentObjectModel;
using MigraDoc.DocumentObjectModel.Visitors;
using MigraDoc.Rendering.Resources;
using PdfSharp.Pdf;
using PdfSharp.Drawing;

namespace MigraDoc.Rendering
{
  /// <summary>
  /// Provides the functionality to convert a MigraDoc document into PDF.
  /// </summary>
  public class PdfDocumentRenderer
  {
    /// <summary>
    /// Initializes a new instance of the PdfDocumentRenderer class.
    /// </summary>
    public PdfDocumentRenderer()
    {
    }

    /// <summary>
    /// Initializes a new instance of the PdfDocumentRenderer class.
    /// </summary>
    /// <param name="unicode">If true Unicode encoding is used for all text. If false, WinAnsi encoding is used.</param>
    public PdfDocumentRenderer(bool unicode)
    {
      this.unicode = unicode;
    }

    /// <summary>
    /// Initializes a new instance of the <see cref="PdfDocumentRenderer"/> class.
    /// </summary>
    /// <param name="unicode">If true Unicode encoding is used for all text. If false, WinAnsi encoding is used.</param>
    /// <param name="fontEmbedding">Specifies which fonts will be imbedded in the PDF file.</param>
    public PdfDocumentRenderer(bool unicode, PdfFontEmbedding fontEmbedding)
    {
      this.unicode = unicode;
      this.fontEmbedding = fontEmbedding;
    }

    /// <summary>
    /// Gets a value indicating whether the text is rendered as Unicode.
    /// </summary>
    public bool Unicode
    {
      get { return this.unicode; }
    }
    bool unicode;

    /// <summary>
    /// Gets a value indicating whether all used fonts are embedded in the document.
    /// </summary>
    public PdfFontEmbedding FontEmbedding
    {
      get { return this.fontEmbedding; }
    }
    PdfFontEmbedding fontEmbedding;

    /// <summary>
    /// Gets or sets the language.
    /// </summary>
    /// <value>The language.</value>
    public string Language
    {
      get { return this.language; }
      set { this.language = value; }
    }
    string language = String.Empty;

    /// <summary>
    /// Set the MigraDoc document to be rendered by this printer.
    /// </summary>
    public Document Document
    {
      set
      {
        this.document = null;
        value.BindToRenderer(this);
        this.document = value;
      }
    }
    Document document;

    /// <summary>
    /// Gets or sets a document renderer.
    /// </summary>
    /// <remarks>
    /// A document renderer is automatically created and prepared
    /// when printing before this property was set.
    /// </remarks>
    public DocumentRenderer DocumentRenderer
    {
      get
      {
        if (this.documentRenderer == null)
          PrepareDocumentRenderer();
        return this.documentRenderer;
      }
      set { this.documentRenderer = value; }
    }
    DocumentRenderer documentRenderer;

    void PrepareDocumentRenderer()
    {
      PrepareDocumentRenderer(false);
    }

    void PrepareDocumentRenderer(bool prepareCompletely)
    {
      if (this.document == null)
        throw new InvalidOperationException(Messages.PropertyNotSetBefore("DocumentRenderer", MethodInfo.GetCurrentMethod().Name));

      if (this.documentRenderer == null)
      {
        this.documentRenderer = new DocumentRenderer(this.document);
        this.documentRenderer.WorkingDirectory = this.workingDirectory;
      }
      if (prepareCompletely && this.documentRenderer.formattedDocument == null)
      {
        this.documentRenderer.PrepareDocument();
      }
    }

    /// <summary>
    /// Renders the document into a PdfDocument containing all pages of the document.
    /// </summary>
    public void RenderDocument()
    {
#if true
      PrepareRenderPages();
#else
      if (this.documentRenderer == null)
        PrepareDocumentRenderer();

      if (this.pdfDocument == null)
      {
        this.pdfDocument = new PdfDocument();
        this.pdfDocument.Info.Creator = VersionInfo.Creator;
      }

      WriteDocumentInformation();
#endif
      RenderPages(1, this.documentRenderer.FormattedDocument.PageCount);
    }

    /// <summary>
    /// Renders the document into a PdfDocument containing all pages of the document.
    /// </summary>
    public void PrepareRenderPages()
    {
      //if (this.documentRenderer == null)
      PrepareDocumentRenderer(true);

      if (this.pdfDocument == null)
      {
        this.pdfDocument = CreatePdfDocument();
        if (this.document.UseCmykColor)
          this.pdfDocument.Options.ColorMode = PdfColorMode.Cmyk;
      }

      WriteDocumentInformation();
      //RenderPages(1, this.documentRenderer.FormattedDocument.PageCount);
    }

    /// <summary>
    /// Gets the count of pages.
    /// </summary>
    public int PageCount
    {
      get { return this.documentRenderer.FormattedDocument.PageCount; }
    }

    /// <summary>
    /// Saves the PdfDocument to the specified path. If a file already exists, it will be overwritten.
    /// </summary>
    public void Save(string path)
    {
      if (path == null)
        throw new ArgumentNullException("path");

      else if (path == "")
        throw new ArgumentException("PDF file Path must not be empty");

      if (this.workingDirectory != null)
        Path.Combine(this.workingDirectory, path);

      this.pdfDocument.Save(path);
    }

    /// <summary>
    /// Saves the PDF document to the specified stream.
    /// </summary>
    public void Save(Stream stream, bool closeStream)
    {
      this.pdfDocument.Save(stream, closeStream);
    }

    /// <summary>
    /// Renders the spcified page range.
    /// </summary>
    /// <param name="startPage">The first page to print.</param>
    /// <param name="endPage">The last page to print</param>
    public void RenderPages(int startPage, int endPage)
    {
      if (startPage < 1)
        throw new ArgumentOutOfRangeException("startPage");

      if (endPage > this.documentRenderer.FormattedDocument.PageCount)
        throw new ArgumentOutOfRangeException("endPage");

      if (this.documentRenderer == null)
        PrepareDocumentRenderer();

      if (this.pdfDocument == null)
        this.pdfDocument = CreatePdfDocument();

      this.documentRenderer.printDate = DateTime.Now;
      for (int pageNr = startPage; pageNr <= endPage; ++pageNr)
      {
        PdfPage pdfPage = this.pdfDocument.AddPage();
        PageInfo pageInfo = this.documentRenderer.FormattedDocument.GetPageInfo(pageNr);
        pdfPage.Width = pageInfo.Width;
        pdfPage.Height = pageInfo.Height;
        pdfPage.Orientation = pageInfo.Orientation;

        using (XGraphics gfx = XGraphics.FromPdfPage(pdfPage))
        {
          gfx.MUH = this.unicode ? PdfFontEncoding.Unicode : PdfFontEncoding.WinAnsi;
          gfx.MFEH = this.fontEmbedding;
          this.documentRenderer.RenderPage(gfx, pageNr);
        }
      }
    }

    /// <summary>
    /// Gets or sets a working directory for the printing process.
    /// </summary>
    public string WorkingDirectory
    {
      get { return this.workingDirectory; }
      set { this.workingDirectory = value; }
    }
    string workingDirectory;

    /// <summary>
    /// Gets or sets the PDF document to render on.
    /// </summary>
    /// <remarks>A PDF document in memory is automatically created when printing before this property was set.</remarks>
    public PdfDocument PdfDocument
    {
      get { return this.pdfDocument; }
      set { this.pdfDocument = value; }
    }
    PdfDocument pdfDocument;

    /// <summary>
    /// Writes document information like author and subject to the PDF document.
    /// </summary>
    public void WriteDocumentInformation()
    {
      if (!this.document.IsNull("Info"))
      {
        DocumentInfo docInfo = this.document.Info;
        PdfDocumentInformation pdfInfo = this.pdfDocument.Info;

        if (!docInfo.IsNull("Author"))
          pdfInfo.Author = docInfo.Author;

        if (!docInfo.IsNull("Keywords"))
          pdfInfo.Keywords = docInfo.Keywords;

        if (!docInfo.IsNull("Subject"))
          pdfInfo.Subject = docInfo.Subject;

        if (!docInfo.IsNull("Title"))
          pdfInfo.Title = docInfo.Title;
      }
    }

    /// <summary>
    /// Creates a new PDF document.
    /// </summary>
    PdfDocument CreatePdfDocument()
    {
      PdfDocument document = new PdfDocument();
      document.Info.Creator = VersionInfo.Creator;
      if (this.language != null && this.language.Length != 0)
        document.Language = this.language;
      return document;
    }
  }
}
